<p>The long suffix should always be written in uppercase, i.e. 'L', as the lowercase 'l' can easily be confused with the digit one '1'.</p>
<p>The following code:</p>
<pre>
long n = 10l;  // Noncompliant - easily confused with one zero one
</pre>
<p>should be refactored into:</p>
<pre>
long n = 10L;  // Compliant
</pre>

